I used an inline fan from an old air-hockey table, with 4" ducting pumping air up through the ceiling to a sealed 3x4x5 box in attic(left it on 24/7, was pretty cold in spring! then HOT.), kept temps btw 68-80 and didn't need an exhaust fan, the box stayed pressurized (when door was closed)and was forced out a right-angle exhaust port, had one adapted PC fan for movement in side box, worked pretty well.
4x5 Reviewed by 4x5 on . Atic Heat problems Hi There, At the moment , I am growing in the atic and the temps get into the high 90s cause in summer its like a sauna up there. What about air coolers ,do they work? I have a 200mm intake & 200 mm out fan, and osculating fan and a dihumidifirer all under a 400wt system. I do run the lights when the sun goes down, to try and keep the temps down.My last grow Oasis from Dutch passion(feminised) turned into hemafridites and i got a crap yeild, but loads of seeds. never again will i buy Rating: 5